Drainage Pipeline Disconnection Repair With Flow-Through Airbag Grouting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional trenchless repair methods for underground drainage pipelines require stopping water flow, are labor-intensive, and may result in environmental pollution and inefficiencies due to detachment of repair materials during the process.
Innovation Solution
An in-service and trenchless repair method using a hollowed cylindrical airbag to press and plug disconnections, combined with drilling holes for injecting a double-slurry quick-curing polymer repair material, allowing for repair without stopping water flow and minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional trenchless repair method using repair airbag with resin is used, then repair can be performed without excavation, but water flow must be stopped and repair materials may detach during the process
Solution Approach 1:
The repair system is segmented into distinct functional components: the hollowed cylindrical airbag for positioning and plugging, the double-slurry quick-curing polymer repair material for sealing, and the through-hole for maintaining water flow. This segmentation allows each component to perform its specific function independently, enabling repair without stopping water flow.
Solution Approach 2:
The repair material is applied locally at the disconnection position through the hollowed cylindrical airbag, while the rest of the pipeline continues to function normally with water flowing through the through-hole. This localized repair approach maintains overall system productivity while addressing the specific defect.
2Reliability
If excavation repair is used, then disconnection can be repaired effectively, but construction speed is slow, traffic impact is large, and environmental pollution occurs
Solution Approach 1:
The repair system extracts the repair materials and equipment into the pipeline through inspection wells using the hollowed cylindrical airbag, eliminating the need for excavation. The repair is performed in-situ within the pipeline, maintaining construction speed and reducing environmental impact while ensuring effective repair of the disconnection.
Solution Approach 2:
The hollowed cylindrical airbag serves as a temporary device that is discarded after use, while the repair material remains in the pipeline to seal the disconnection. This approach eliminates the need for complex equipment retrieval and reduces construction time compared to traditional excavation methods.
3Reliability
If repair airbag with resin is used, then disconnection can be sealed, but resin and repair materials may detach during sending to damaged position, affecting repair efficiency
Solution Approach 1:
The repair system uses a composite double-slurry quick-curing polymer repair material consisting of two components that mix and cure rapidly upon contact. This composite material provides superior adhesion and structural integrity compared to single-component resins, preventing detachment during transport and application while ensuring reliable sealing of the disconnection.
4Ease of manufacture
If water flow is stopped during repair, then repair can be performed safely, but operating load on drainage system increases significantly
Solution Approach 1:
The hollowed cylindrical airbag acts as an intermediary device that isolates the repair zone from the flowing water. The through-hole allows water to pass through the airbag, maintaining flow continuity while the airbag provides a stable environment for material application. This intermediary structure enables safe repair without stopping water flow, avoiding increased operational load on the drainage system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables rapid and efficient repair of disconnections in underground drainage pipelines with reduced environmental impact and operational load, maintaining water flow during the process and improving repair efficiency.
Implementation Method 1
turning on an air compressor on the ground surface to inflate the hollowed cylindrical airbag through an air pipe, in such a manner that the hollowed cylindrical airbag is inflated and presses a pipeline wall
Implementation Method 2
sewage continues to flow through a through-hole in a middle of the hollowed cylindrical airbag
Implementation Method 3
injects a new type of double-slurry quick-curing polymer repair material for external grouting point maintenance at the disconnection of the drainage pipeline, thereby rapidly repairing the disconnection
Data Source
AI summary
A in-service trenchless repair method for disconnection of a drainage pipe includes steps of: detecting the disconnection by a pipe sonar, and making a traction rope; pulling a hollowed cylindrical airbag to the disconnection according to the mark on the traction rope; controlling an airbag valve by an air compressor on the ground to inflate the hollowed cylindrical airbag, so that the hollowed cylindrical airbag is in close contact with pipeline wall after inflation; drilling a grouting hole on the ground surface directly above and on both sides of the disconnection until reaching the disconnection, and inserting a grouting pipe into the grouting hole; then injecting a double-slurry quick-curing repair material into the disconnection through a grouting system on the ground and waiting for curing; deflating the hollowed cylindrical airbag and pulling out by the traction rope.